Enable Lambda function to an S3 bucket using cloudformation

Question

We are creating an S3 bucket using a CloudFormation template. I would like to associate (Add an event to S3 bucket) a Lambda function whenever a file is added to the S3 bucket.

Answer 1

It is clearly stated in AWS docs that AWS::S3::Bucket is used to create a resource, If we have a bucket that exists already we can not modify it to add NotificationConfiguration. So S3 bucket must not exist for above template to work. Let CloudFormation creates all resources including S3 bucket.